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The drying up of the sahara force farmers to move away from what had once been lush green areas to other areas that did not suffer from such ecologicak change
The drying of soil in Africa was desertification.
It is?
The drying itself is (always) a physical change.
A physical change
No.
No.
Drying (involving only the water evaporation) is a physical change.
Freeze-drying is a chemical change because it changes the actual composition of the object by removing water.
No. Physical cause it hasn't changed its just gone from wet to dry :-)
Yes.
No. But the do get smaller.